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Application programming interfaces and classes for execution environments. 
<h2>
Package Specification</h2>
<p>Provides support for execution environments. </p>
<p>An execution environment describes the capabilities of a Java runtime environment, 
  for example J2SE-1.4. This package provides facilities for contributing execution 
  environments and providing analyzers to identify JREs as compatible with execution 
  environments.</p>
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